build: Update minimum required tqdm release to avoid repr crash

[matthewfeickert]

Description

As tqdm/tqdm#624 which @kratsg opened up has been resolved, take advantage of its resolution by picking up the release in which is it fixed, v4.56.1, by requiring a minimum compatible version of tqdm of v4.56 in setup.cfg.

Example of it working now:

>>> import tqdm
>>> import sys
>>> print(tqdm.__version__, sys.version, sys.platform)
4.56.1 3.8.6 (default, Jan  5 2021, 00:14:15) 
[GCC 9.3.0] linux
>>> a = tqdm.tqdm([], disable=True)
>>> print(a)
0it [00:00, ?it/s]
>>> str(a)
'0it [00:00, ?it/s]'
>>> dir(a)
['__bool__', '__class__', '__del__', '__delattr__', '__dict__', '__dir__', '__doc__', '__enter__', '__eq__', '__exit__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__iter__', '__le__', '__len__', '__lt__', '__module__', '__ne__', '__new__', '__nonzero__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_comparable', '_decr_instances', '_get_free_pos', '_instances', '_lock', 'clear', 'close', 'disable', 'display', 'external_write_mode', 'format_dict', 'format_interval', 'format_meter', 'format_num', 'format_sizeof', 'get_lock', 'iterable', 'leave', 'monitor', 'monitor_interval', 'moveto', 'n', 'pandas', 'pos', 'refresh', 'reset', 'set_description', 'set_description_str', 'set_lock', 'set_postfix', 'set_postfix_str', 'status_printer', 'total', 'unpause', 'update', 'wrapattr', 'write']

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Update tqdm to require tqdm v4.56 as minimum to get tqdm.__repr__() crash fix
   - c.f. https://github.com/tqdm/tqdm/issues/624
   - Fix was released in tqdm v4.5.6.1, but minimum of v4.56 will pick this up

[codecov]

Codecov Report

Merging #1302 (96f8380) into master (29410b7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1302   +/-   ##
=======================================
  Coverage   97.49%   97.49%           
=======================================
  Files          63       63           
  Lines        3749     3749           
  Branches      535      535           
=======================================
  Hits         3655     3655           
  Misses         55       55           
  Partials       39       39           

Flag	Coverage Δ
unittests	97.49% <ø> (ø)

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